A brief introduction to the anti-counterfeiting principle of holographic trademarks
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The holographic anti-counterfeiting trademark usually refers to a hologram recorded with a specific pattern and text representing a certain commodity. The main principle of the hologram to play an anti-counterfeiting effect is:
First, the production and reproduction technology of holograms is high in content, requires specialized personnel, and the process is complicated. Holography itself is a high-tech, it not only needs to be equipped with high-quality anti-vibration tables, lasers and various optical parts as well as specialized chemicals, but more importantly, it needs to be operated by skilled and experienced professionals. In order to produce a qualified hologram master. The grating density on the hologram is usually 1000 lines/mm, and the undulation height is only a few tenths of micrometers, so an electroforming process and a high-precision, high-quality molded copying apparatus and a hologram copying machine are required. Compared with the ordinary printing technology that can produce products by manual operation only by conventional equipment, the production of holographic trademarks shows that the production is difficult and difficult to copy from the aspects of technology, personnel, process, equipment investment and the like.
Second, holograms have their own structure that is difficult to imitate. Most molded anti-counterfeiting labels are now rainbow holograms that record one or more two-dimensional planar patterns. By utilizing the hologram to reproduce the characteristics of the three-dimensional stereoscopic image, two (or more) planar patterns can be hierarchically recorded in the hologram in the longitudinal direction by encoding, thereby reproducing planar images at different depths and having an occlusion relationship with each other. Since the rainbow hologram has the property of variable color of the reproduced image, a false color coding technique can be employed to cause different patterns or different portions of the same pattern to reproduce different colors. And because the hologram itself is a complex grating with extremely high density, even if the same person uses the same pattern in different places, it is impossible to produce two holograms with the same grating, and different people are more difficult to copy. The most obvious difference is the difference in depth and color distribution of the reconstructed image, and of course the differences in diffraction efficiency, viewing angle and signal-to-noise ratio. So even with a full set of equipment and technology, it is not an easy task to imitate the molded holographic anti-counterfeiting logo of other homes.
Third, there is implicit encryption information. Encryption can be performed in holograms using special optical coding techniques that either change the size of the reconstructed object as the distance between the human eye and the hologram changes, or store additional points at a point on the hologram Information, or holograms themselves are generated by computers, and so on. A hologram with a special three-dimensional object model as a target reproduces a stereoscopic view identical to the original. Due to the higher technical content of the above items, it is more difficult to be copied.
Fourth, it has a material anti-copy function. Above we have only analyzed the refractory nature of holograms from the perspective of holographic processes. However, there is a practice in real life in which the removed embossed hologram is used as a master to remove the film of the aluminum layer, and the metal stencil is electroformed and then molded on the machine. Although the diffraction efficiencies, signal-to-noise ratios, and other indicators of the embossed holograms thus produced are reduced compared with the real products, the end result is that although the anti-imitation means is used in holography, it is difficult to escape from being easily copied. Doom. In order to solve this problem, an anti-depression type and hot stamping type aluminum film embossing hologram with anti-copy function has been developed.
The basic principle of anti-copying of the tamper-evident (also known as disposable) embossed hologram is that the lower surface of the resin layer connected to the holographic sheet polyester material is plated with a pressure-sensitive adhesive coated on the aluminum layer which is molded and deformed into a grating carrier. The entire molded hologram can be attached to the load. When the hologram is removed, the upper polyester film will be peeled off from the resin layer while a portion of the aluminum layer will be adhered. The film of the polyester material that was removed had no grating at all, and the hologram remaining on the bearing was incompletely damaged, so that imitation could not be performed at all.
The hot stamping hologram structure is basically the same as the tamper-evident hologram. The difference is that the separation between the uppermost polyester film and the resin layer of the former produces good separation when hot stamping is applied, and is applied to the bottom layer. The thermal adhesive has a strong adhesiveness when subjected to heat, so that the aluminum layer and the resin layer with the grating are tightly and completely adhered to the support, and cannot be removed at all.
Of course, from a philosophical point of view, there is neither an invincible spear nor an unbreakable shield in the world. Like all other things, there is always such a contradictory relationship between anti-counterfeiting and forgery. In order to make the holographic trademark have much higher anti-counterfeiting performance than the trademark produced by other printing methods, it is necessary to continuously research and develop new technologies and develop new products in holographic plate making, printing process, material production and other aspects.